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		<style type="text/css">
			a::after{
				content: "[点击下载]";
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			a[href$=".doc"]::before{
				content: url(../../src/word.png);
			}
			a[href$=".pdf"]::before{
				content: url(../../src/pdf.png);
			}
			a[href$=".ppt"]::before{
				content: url(../../src/ppt.png);
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			a[href$=".xls"]::before{
				content: url(../../src/excel.png);
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		<a href="1.doc">1.doc</a><br>
		<a href="2.doc">2.doc</a><br>
		<a href="3.doc">3.doc</a><br>
		<a href="4.pdf">4.pdf</a><br>
		<a href="5.ppt">5.ppt</a><br>
		<a href="6.xls">6.xls</a><br>
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